test: add benchmarks

[elhimov]

I didn't forget about (remove if it is not applicable):

• Tests (see documentation for a testing package)
• Changelog (see documentation for changelog format)
• Documentation (see documentation for documentation style guide)

Related issues:

Closes TNTP-3733

[coveralls]

coverage: 91.616%. remained the same
when pulling 4dd55cd on elhimov/tntp-3733-import-and-actualize-benchmarks
into d70dadd on master.